Between the T56 and the TKO600, I'd go TKO600. It's smaller and more useable than the T56 IMO. I used a T56 in my '68 Nova and had to remove most if not all of the trans tunnel and some of the driveshaft tunnel. I had 28" tires and 4.33s and found 6th to totally useless. Car had a monster cam in it so it didn't like being under 1500 rpm on the freeway. The last car I did had a Richmond 5 speed in it which I found to be better than my TKO and the T56. It shifted better, zero tunnel mods in a '67 Chevelle, and was capable of plenty of power shifting abuse.
I looked closely at the McLeod at SEMA last year and really liked what they had done. It's effectively an internal rail Richmond, but with a much more updated case and design. Like the Richmond, it won't require any tunnel mods in an early car which is bitchin IMO. The only drawback is that it's only rated at 500HP and 500 torks. depending on how much animal you have up front, it might be the best choice of all.
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1929 Roadster Pickup
1961 Chevy Parkwood Wagon
1956 Chevy 210
Smithcraft Collision and Restoration
Newcastle , CA
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